JP4495585B2 - Resin lens mold - Google Patents

Resin lens mold Download PDF

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JP4495585B2
JP4495585B2 JP2004376024A JP2004376024A JP4495585B2 JP 4495585 B2 JP4495585 B2 JP 4495585B2 JP 2004376024 A JP2004376024 A JP 2004376024A JP 2004376024 A JP2004376024 A JP 2004376024A JP 4495585 B2 JP4495585 B2 JP 4495585B2
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pair
mirror
molding
core support
resin lens
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JP2006181789A (en
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信一 東原
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Hoya Corp
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本発明は、樹脂レンズの成形型に関し、特に直径が数ｍｍ程度以下の微小レンズの成形に適した成形型に関する。   The present invention relates to a resin lens mold, and more particularly to a mold suitable for molding a microlens having a diameter of about several millimeters or less.

レンズを樹脂材料で成形する際に用いる従来の成形型は、表裏のレンズ面に対応する鏡面を有する一対の鏡面コアの一方を固定側、他方を可動側としている。この固定側鏡面コアは固定鏡面コア用胴型のコア支持孔に挿入固定されており、可動側の鏡面コアは可動鏡面コア用胴型のコア摺動支持孔に摺動可能に支持されている。この成形型では、一対の胴型を閉じて一対の鏡面コアの間の成形空間で成形を終了した後に一対の胴型を開き、その後、可動鏡面コアをコア摺動支持孔に対して摺動させることで、可動鏡面コア用胴型から突き出して樹脂レンズ（成形終了品）を取り出している。
特開平８-３０９８７３号公報 In a conventional mold used for molding a lens with a resin material, one of a pair of mirror cores having mirror surfaces corresponding to front and back lens surfaces is a fixed side and the other is a movable side. The fixed-side mirror core is inserted and fixed in the core support hole of the fixed-type mirror core body, and the movable-side mirror core is slidably supported by the core-type sliding support hole of the movable mirror-core body. . In this mold, the pair of barrel molds are closed and molding is completed in the molding space between the pair of mirror cores, and then the pair of cylinder molds is opened, and then the movable mirror core is slid against the core sliding support hole. By doing so, the resin lens (molded product) is taken out by protruding from the movable mirror surface core mold.
JP-A-8-309873

ところがこの従来の成形型では、成形するレンズが直径数ｍｍ程度以下の微小レンズとなると、十分な光学性能が得られないことが明らかになってきた。諸収差、特にコマ収差が大きく出てしまう。従って本発明は、微小レンズを高精度に成形できる成形型を得ることを目的とする。   However, in this conventional mold, it has become clear that sufficient optical performance cannot be obtained when the lens to be molded is a microlens having a diameter of about several millimeters or less. Various aberrations, particularly coma aberration, are greatly generated. Accordingly, an object of the present invention is to obtain a mold that can mold a microlens with high accuracy.

本発明者は、微小レンズの成形において特にコマ収差が大きくなる原因を追及した結果、従来の成形型では、鏡面コアの一方の可動鏡面コアを、対応する胴型のコア支持孔に対して摺動させているため、摺動クリアランスが必要であり、このクリアランスが面精度に悪影響を与えるという結論に達してなされたものである。
また、従来の樹脂レンズの成形において、イジェクトピンを使用するタイプでは、イジェクトピンが円形のレンズの周縁一部に当接するため、成形精度に悪影響を与える。 As a result of pursuing the cause of particularly large coma aberration in the molding of the microlens, the present inventor slidably moves one movable mirror core of the mirror core with respect to the corresponding core support hole of the barrel mold. Since it is moved, a sliding clearance is necessary, and the conclusion was reached that this clearance adversely affects surface accuracy.
Further, in the conventional molding of resin lenses, in the type using an eject pin, the eject pin is brought into contact with a part of the peripheral edge of the circular lens, which adversely affects molding accuracy.

本発明は、表裏のレンズ面に対応する成形鏡面を有する一対の鏡面コアを、開閉可能な一対の胴型のコア支持孔にそれぞれ挿入支持した樹脂レンズの成形型において、一対の鏡面コアを対応する胴型のコア支持孔にそれぞれ挿入して固定し、一対の胴型の少なくとも一方に、該一対の胴型のパーティングラインに臨ませて、一対の鏡面コアによる成形空間から放射方向に延びる少なくとも二つの径方向突起形成空間を形成し、一対の胴型のいずれか一方に、この径方向突起形成空間に延びるイジェクトピンを進退自在に支持し、さらに一対の鏡面コアは、先端部に成形鏡面を有する小径部と、この小径部に連なる大径部とを有しており、この一対の鏡面コアに対応する一対の胴型にはそれぞれ、この小径部と大径部に対応する小径コア支持孔と大径コア支持孔が形成されており、各鏡面コアの小径部と胴型の小径コア支持孔との間のクリアランスは、大径部と大径コア支持孔との間のクリアランスより小さく設定されていることを特徴としている。 The present invention relates to a pair of mirror cores in a resin lens molding die in which a pair of mirror cores having molding mirror surfaces corresponding to the front and back lens surfaces are inserted and supported in a pair of core support holes that can be opened and closed, respectively. Each of the pair of body molds is inserted into and fixed to a core support hole of the body mold so as to face a parting line of the pair of body molds, and extends radially from a molding space formed by the pair of mirror cores. At least two radial projection forming spaces are formed, and an eject pin extending into the radial projection forming space is supported on one of a pair of body molds so as to be movable forward and backward, and a pair of mirror cores are formed at the tip portion. It has a small-diameter part having a mirror surface and a large-diameter part connected to the small-diameter part, and a pair of body molds corresponding to the pair of mirror-surface cores has a small-diameter core corresponding to the small-diameter part and the large-diameter part, respectively. Support hole A large-diameter core support hole is formed, and the clearance between the small-diameter part of each specular core and the small-diameter core support hole of the body is set smaller than the clearance between the large-diameter part and the large-diameter core support hole. It is characterized by having.

一対の鏡面コアの成形鏡面の曲率半径には大小があるのが普通である。径方向突起形成空間は、成形樹脂レンズの厚さ方向の曲率半径が大きい側に偏らせて形成することが好ましい。   In general, the radius of curvature of the mirror surface of the pair of mirror cores is large or small. The radial protrusion forming space is preferably formed so as to be biased toward the side with the larger curvature radius in the thickness direction of the molded resin lens.

そして、イジェクトピンは、曲率半径の小さい側の鏡面コアを有する胴型に進退可能に支持するのがよい。   The eject pin is preferably supported so as to be capable of advancing and retracting to a body mold having a mirror core on the side with a small curvature radius.

径方向突起形成空間は、１２０゜間隔で３個設けるのが最も好ましい。Most preferably, three radial protrusion forming spaces are provided at intervals of 120 °.

本発明によれば、直径数ｍｍ程度以下の微小レンズを高精度に成形できる成形型を得ることができる。   According to the present invention, it is possible to obtain a molding die capable of molding a minute lens having a diameter of about several millimeters or less with high accuracy.

図１、図２に示すように、パーティングラインＰＬで開閉可能な一対の胴型１０と２０にはそれぞれ、同一軸線上に位置するコア支持孔１１とコア支持孔２１が形成されている。このコア支持孔１１とコア支持孔２１は、パーティングラインＰＬ側の小径コア支持孔１１ａ、２１ａと、この小径コア支持孔１１ａ、２１ａに連なる大径コア支持孔１１ｂ、２１ｂとからなっており、大径コア支持孔１１ｂ、２１ｂの外側には、同軸に蓋部材固定孔１２、２２が形成されている。   As shown in FIGS. 1 and 2, a pair of body molds 10 and 20 that can be opened and closed by a parting line PL are respectively formed with a core support hole 11 and a core support hole 21 positioned on the same axis. The core support hole 11 and the core support hole 21 include small-diameter core support holes 11a and 21a on the parting line PL side, and large-diameter core support holes 11b and 21b connected to the small-diameter core support holes 11a and 21a. The lid member fixing holes 12 and 22 are coaxially formed outside the large diameter core support holes 11b and 21b.

コア支持孔１１とコア支持孔２１にはそれぞれ、鏡面コア１３と鏡面コア２３が挿入支持されている。鏡面コア１３は、小径コア支持孔１１ａに対応する小径部１３ａと大径コア支持孔１１ｂに対応する大径部１３ｂとを有しており、小径部１３ａの先端部にパーティングラインＰＬに臨む成形鏡面１３ｃが形成されている。同様に、鏡面コア２３は、小径コア支持孔２１ａに対応する小径部２３ａと大径コア支持孔２１ｂに対応する大径部２３ｂとを有しており、小径部２３ａの先端部にパーティングラインＰＬに臨む成形鏡面２３ｃが形成されている。この実施形態では、成形鏡面２３ｃの曲率半径（曲率）が成形鏡面１３ｃの曲率半径（曲率）より小さい（大きい）。   The mirror core 13 and the mirror core 23 are inserted and supported in the core support hole 11 and the core support hole 21, respectively. The mirror core 13 has a small diameter portion 13a corresponding to the small diameter core support hole 11a and a large diameter portion 13b corresponding to the large diameter core support hole 11b, and faces the parting line PL at the tip of the small diameter portion 13a. A molded mirror surface 13c is formed. Similarly, the mirror core 23 has a small-diameter portion 23a corresponding to the small-diameter core support hole 21a and a large-diameter portion 23b corresponding to the large-diameter core support hole 21b, and a parting line at the tip of the small-diameter portion 23a. A molded mirror surface 23c facing the PL is formed. In this embodiment, the radius of curvature (curvature) of the shaped mirror surface 23c is smaller (larger) than the radius of curvature (curvature) of the shaped mirror surface 13c.

この鏡面コア１３と２３はそれぞれ、コア支持孔１１と２１に挿入した後、蓋部材固定孔１２と２２に挿入固定される固定蓋１４と２４に固定ねじ１５と２５を介して固定され、その成形鏡面１３ｃと成形鏡面２３ｃ（及び小径コア支持孔２１ａ）によって、樹脂レンズの成形空間が形成される。この成形空間はパーティングラインＰＬに臨んでいる。鏡面コア１３と固定蓋１４の間、鏡面コア２３と固定蓋２４の間にはそれぞれ適当な厚さのスペーサを介在させることができる。   The mirror cores 13 and 23 are inserted into the core support holes 11 and 21, respectively, and then fixed to the fixing lids 14 and 24 inserted and fixed in the lid member fixing holes 12 and 22 via fixing screws 15 and 25, respectively. A molding space for the resin lens is formed by the molding mirror surface 13c and the molding mirror surface 23c (and the small-diameter core support hole 21a). This molding space faces the parting line PL. Spacers of appropriate thickness can be interposed between the mirror core 13 and the fixed lid 14 and between the mirror core 23 and the fixed lid 24, respectively.

このように、胴型１０のコア支持孔１１に対して鏡面コア１３を挿入固定し、胴型２０のコア支持孔２１に対して鏡面コア２３を挿入固定することで、小径コア支持孔１１ａと小径部１３ａの間のクリアランス、及び小径コア支持孔２１ａと小径部２３ａとの間のクリアランスを最小にすることができる。具体的には小径コア支持孔１１ａ（小径コア支持孔２１ａ）の直径（成形レンズの直径）が数ｍｍ程度のとき、このクリアランスを１μｍ以下程度とすることができる。従来装置では、小径部１３ａと小径部２３ａのいずれか一方を小径コア支持孔１１ａと小径コア支持孔２１ａに対して進退可能としているため、このような小さいクリアランスは実現できず、このクリアランスが面精度を悪化させる原因であった。   In this way, by inserting and fixing the mirror core 13 in the core support hole 11 of the trunk mold 10 and inserting and fixing the mirror core 23 in the core support hole 21 of the trunk mold 20, the small-diameter core support hole 11 a The clearance between the small diameter portions 13a and the clearance between the small diameter core support holes 21a and the small diameter portions 23a can be minimized. Specifically, when the diameter of the small-diameter core support hole 11a (small-diameter core support hole 21a) (the diameter of the molded lens) is about several mm, the clearance can be set to about 1 μm or less. In the conventional apparatus, since either one of the small diameter portion 13a and the small diameter portion 23a can be advanced and retracted with respect to the small diameter core support hole 11a and the small diameter core support hole 21a, such a small clearance cannot be realized, and this clearance is not a surface. It was the cause that deteriorated accuracy.

また、大径コア支持孔１１ｂと大径部１３ｂとの間のクリアランス（大径コア支持孔２１ｂと大径部２３ｂとの間のクリアランス）は、この小径コア支持孔１１ａと小径部１３ａとの間のクリアランス（小径コア支持孔２１ａと小径部２３ａとの間のクリアランス）より大きく設定されている。このように、クリアランスに差を与えることで、鏡面コア１３と２３のコア支持孔１１と２１への挿入作業が容易になる。   The clearance between the large-diameter core support hole 11b and the large-diameter portion 13b (clearance between the large-diameter core support hole 21b and the large-diameter portion 23b) is between the small-diameter core support hole 11a and the small-diameter portion 13a. It is set larger than the clearance between them (the clearance between the small-diameter core support hole 21a and the small-diameter portion 23a). Thus, by providing a difference in the clearance, the work of inserting the mirror cores 13 and 23 into the core support holes 11 and 21 is facilitated.

胴型２０には、パーティングラインＰＬに臨ませて、成形鏡面１３ｃと成形鏡面２３ｃによって形成される成形空間に連通する３個の径方向突起形成空間（凹部）２６が形成されている。この径方向突起形成空間２６は、成形される樹脂レンズＳＬの形状を示す図３に明らかなように、樹脂レンズ成形空間の周囲に１２０゜間隔で設けられている。樹脂レンズＳＬは、中心円形部ＳＬ１と、この３個の径方向突起形成空間２６に対応する３個の径方向突起ＳＬ２とを一体に有することになる。この径方向突起形成空間２６は、樹脂レンズＳＬの厚さ方向に関して、成形鏡面１３ｃ側（つまり曲率半径の大きい側）に偏らせて設けられており、胴型２０には、各径方向突起形成空間２６に延びるイジェクトピン２７を摺動自在に挿入させるピン孔２８が形成されている。ピン孔２８（イジェクトピン２７）は、コア支持孔２１と平行に延び、鏡面コア２３の大径部２３ｂにはピン孔２８と同一軸線上にピン孔２３ｄが形成されている。イジェクトピン２７は、イジェクトピン駆動板２９によって軸方向に進退できる。胴型１０と胴型２０には、そのパーティングラインＰＬに臨ませて成形鏡面１３ｃと成形鏡面２３ｃによって形成される成形空間に連通するゲート（樹脂材料注入部）３０が形成されている。   The body mold 20 is formed with three radial projection forming spaces (concave portions) 26 that face the parting line PL and communicate with the molding space formed by the molding mirror surface 13c and the molding mirror surface 23c. As is apparent from FIG. 3 showing the shape of the resin lens SL to be molded, the radial projection forming spaces 26 are provided at intervals of 120 ° around the resin lens molding space. The resin lens SL integrally includes a central circular portion SL1 and three radial protrusions SL2 corresponding to the three radial protrusion forming spaces 26. The radial projection forming space 26 is provided so as to be biased toward the molding mirror surface 13c side (that is, the side having the larger curvature radius) with respect to the thickness direction of the resin lens SL. A pin hole 28 into which an eject pin 27 extending into the space 26 is slidably inserted is formed. The pin hole 28 (eject pin 27) extends in parallel with the core support hole 21, and a pin hole 23 d is formed on the large diameter portion 23 b of the mirror core 23 on the same axis as the pin hole 28. The eject pin 27 can be advanced and retracted in the axial direction by an eject pin drive plate 29. Formed on the body mold 10 and the body mold 20 are gates (resin material injection portions) 30 that face the parting line PL and communicate with the molding space formed by the molding mirror surface 13c and the molding mirror surface 23c.

上記構成の本成形型による成形は、胴型１０と胴型２０を型締めした状態において、ゲート３０から成形鏡面１３ｃと成形鏡面２３ｃによる成形空間に樹脂材料を注入して行う。すると、成形鏡面１３ｃと成形鏡面２３ｃにより樹脂レンズＳＬの中心円形部ＳＬ１が成形され、径方向突起形成空間２６によって径方向突起ＳＬ２が成形される。注入樹脂材料が硬化した後、胴型１０と胴型２０を開くと、曲率半径の小さい成形鏡面２３ｃ側に樹脂レンズＳＬが付着した状態となる。この状態において、イジェクトピン駆動板２９を介してイジェクトピン２７を径方向突起形成空間２６側に突き出すと、樹脂レンズＳＬの径方向突起ＳＬ２が突き出され、成形鏡面２３ｃから離型して取り出される。   Molding by the main mold having the above-described configuration is performed by injecting a resin material from the gate 30 into the molding space formed by the molding mirror surface 13c and the molding mirror surface 23c in a state where the body mold 10 and the body mold 20 are clamped. Then, the central circular portion SL1 of the resin lens SL is molded by the molded mirror surface 13c and the molded mirror surface 23c, and the radial projection SL2 is molded by the radial projection forming space 26. When the barrel mold 10 and the barrel mold 20 are opened after the injected resin material is cured, the resin lens SL is attached to the molding mirror surface 23c side having a small curvature radius. In this state, when the eject pin 27 is protruded toward the radial protrusion forming space 26 via the eject pin drive plate 29, the radial protrusion SL2 of the resin lens SL is protruded and released from the molding mirror surface 23c.

以上の実施形態のように、樹脂レンズＳＬの中心円径部ＳＬ１に、径方向突起ＳＬ２を形成し、この径方向突起ＳＬ２をイジェクトピン２７で押圧して離型させることで、樹脂レンズＳＬの変形（面精度の悪化）が抑制される。また、径方向突起ＳＬ２を樹脂レンズＳＬの曲率半径の小さい面から離間させた（曲率半径の大きい面に接近させた）偏心位置に設け、該曲率半径の小さい面側からイジェクトピン２７で突き出すことで、さらに樹脂レンズＳＬの変形を抑制することができる。なお、樹脂レンズＳＬの径方向突起ＳＬ２は、位置決め突起として利用することが可能であるが、不要な場合は切除することができる。
As in the above embodiment, the radial projection SL2 is formed on the central circular diameter portion SL1 of the resin lens SL, and the radial projection SL2 is pressed with the eject pin 27 to release the resin lens SL. Deformation (deterioration of surface accuracy) is suppressed. Further, the radial protrusion SL2 is provided at an eccentric position separated from the surface having a small radius of curvature of the resin lens SL (approached to a surface having a large radius of curvature), and is projected by the eject pin 27 from the surface having the small radius of curvature. Thus, the deformation of the resin lens SL can be further suppressed. Note that the radial projection SL2 of the resin lens SL can be used as a positioning projection, but can be excised if unnecessary.

本発明による樹脂（微小）レンズの成形型の一実施形態を示す型締め状態の断面図である。It is sectional drawing of the clamping state which shows one Embodiment of the shaping | molding die of the resin (micro) lens by this invention. 図１のII部分の拡大断面図である。It is an expanded sectional view of the II part of FIG. 成形される樹脂（微小）レンズの正面図である。It is a front view of a resin (microscopic) lens to be molded.

符号の説明Explanation of symbols

１０ ２０ 胴型
１１ ２１ コア支持孔
１１ａ ２１ａ 小径コア支持孔
１１ｂ ２１ｂ 大径コア支持孔
１２ ２２ 蓋部材固定孔
１３ ２３ 鏡面コア
１３ａ ２３ａ 小径部
１３ｂ ２３ｂ 大径部
１３ｃ ２３ｃ 成形鏡面
１４ ２４ 固定蓋
１５ ２５ 固定ねじ
２３ｄ ピン孔
２６ 径方向突起形成空間（凹部）
２７ イジェクトピン
２８ ピン孔
２９ イジェクトピン駆動板
３０ ゲート（樹脂材料注入部）
ＳＬ 樹脂レンズ
ＳＬ１ 中心円形部
ＳＬ２ 径方向突起
ＰＬ パーティングライン 10 20 Body type 11 21 Core support hole 11a 21a Small diameter core support hole 11b 21b Large diameter core support hole 12 22 Lid member fixing hole 13 23 Mirror surface core 13a 23a Small diameter part 13b 23b Large diameter part 13c 23c Molding mirror surface 14 24 Fixed lid 15 25 Fixing screw 23d Pin hole 26 Radial protrusion formation space (concave)
27 Eject pin 28 Pin hole 29 Eject pin drive plate 30 Gate (resin material injection part)
SL Resin lens SL1 Center circular part SL2 Radial protrusion PL Parting line

Claims (4)

表裏のレンズ面に対応する成形鏡面を有する一対の鏡面コアを、開閉可能な一対の胴型のコア支持孔にそれぞれ挿入支持した樹脂レンズの成形型において、
上記一対の鏡面コアを対応する胴型のコア支持孔にそれぞれ挿入して固定し、
一対の胴型の少なくとも一方に、該一対の胴型のパーティングラインに臨ませて、一対の鏡面コアによる成形空間から放射方向に延びる少なくとも二つの径方向突起形成空間を形成し、
上記一対の胴型のいずれか一方に、この径方向突起形成空間に延びるイジェクトピンを進退自在に支持し、
さらに、上記一対の鏡面コアは、先端部に成形鏡面を有する小径部と、この小径部に連なる大径部とを有しており、この一対の鏡面コアに対応する一対の胴型にはそれぞれ、この小径部と大径部に対応する小径コア支持孔と大径コア支持孔が形成されており、
各鏡面コアの小径部と胴型の小径コア支持孔との間のクリアランスは、大径部と大径コア支持孔との間のクリアランスより小さく設定されていることを特徴とする樹脂レンズの成形型。 In a resin lens molding die in which a pair of mirror cores having molding mirror surfaces corresponding to the front and back lens surfaces are inserted and supported in a pair of core support holes that can be opened and closed, respectively.
The pair of mirror cores are respectively inserted and fixed into corresponding core-shaped core support holes,
At least one of the pair of barrel molds faces at the parting line of the pair of barrel molds, and forms at least two radial projection forming spaces extending in a radial direction from a molding space by the pair of mirror surface cores,
On either one of the pair of body molds, an eject pin extending into the radial protrusion forming space is supported so as to freely advance and retract.
Further, the pair of mirror cores has a small diameter part having a molded mirror surface at the tip part and a large diameter part connected to the small diameter part. The small diameter core support hole and the large diameter core support hole corresponding to the small diameter part and the large diameter part are formed,
Molding of a resin lens characterized in that the clearance between the small-diameter portion of each specular core and the small-diameter core support hole of the body mold is set smaller than the clearance between the large-diameter portion and the large-diameter core support hole. Type. 請求項１記載の樹脂レンズの成形型において、一対の鏡面コアの成形鏡面の曲率半径には大小があり、上記径方向突起形成空間は、成形樹脂レンズの厚さ方向の曲率半径が大きい側に偏らせて形成されている樹脂レンズの成形型。 The molding die for a resin lens according to claim 1, wherein the radius of curvature of the molding mirror surface of the pair of mirror cores is large and the radial projection forming space is on a side where the curvature radius in the thickness direction of the molding resin lens is large. Resin lens mold formed by biasing. 請求項１または２記載の樹脂レンズの成形型において、イジェクトピンは、曲率半径の小さい側の鏡面コアを有する胴型に進退可能に支持されている樹脂レンズの成形型。 3. The resin lens mold according to claim 1, wherein the eject pin is supported by a barrel mold having a mirror surface core having a smaller radius of curvature so as to be able to advance and retract. 請求項１ないし３のいずれか１項記載の樹脂レンズの成形型において、上記径方向突起形成空間は、１２０゜間隔で３個設けられている樹脂レンズの成形型。4. The resin lens mold according to claim 1, wherein three radial protrusion forming spaces are provided at intervals of 120 [deg.].
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